Sound level and subjective response to sound; Frequency dependent human response to
sound, Sound pressure dependent human response. Decibel scale; Decibel addition,
subtraction and averaging. Relationship among sound power, sound intensity and sound
pressure level. Sound spectra. Octave band analysis. Loudness. Noise: Effects, Ratings and
Regulations; Non-auditory effects of noise on people, Auditory Effects of noise, Noise
standards and limits in India. Major sources of the noise; Industrial noise sources. Industrial
noise control-strategies; Noise control at the source, Noise control along the path, Acoustic
barriers, Noise control at the receiver.
Units: II
Scope of vibration, important terminology and classification, Degrees of freedom, Harmonic
motion; vectorial representation, complex number representation, addition. Derivation of
equation of motion for one dimensional longitudinal, transverse and torsional vibrations
without damping using Newton’s second law, D’ Alembert’s principle and Principle of
conservation of energy. Compound pendulum and centre of percussion. Damped vibrations
of single degree of freedom systems. Viscous damping; underdamped, critically damped and
overdamped systems, Logarithmic decrement. Vibration characteristics of Coulomb damped
and Hysteretic damped systems.
Units: III
Forced vibrations of single degree of freedom systems. Forced vibration with constant
harmonic excitation. Steady state and transient parts. Frequency response curves and phase
angle plot. Forced vibration due to excitation of support. Vibration Isolation and
transmissibility; Force transmissibility, Motion transmissibility. Forced vibration with
rotating and reciprocating unbalance. Materials used in vibration isolation
Units: IV
System with two degrees of freedom; principle mode of vibration, Mode shapes. Undamped
forced vibrations of two degrees of freedom system with harmonic excitation. Vibration
Absorber; Undamped dynamic vibration absorber and centrifugal pendulum absorber. Many
degrees of freedom systems: exact analysis.
Units: V
Many degrees of freedom systems: approximate methods; Rayleigh’s, Dunkerley’s, Stodola’s
and Holzer’s methods. Vibrations of continuous systems; Transverse vibration of a string,
Longitudinal vibration of a bar, Torsional vibration of a shaft.